Three cars on a NJ Transit train derailed early Monday as it pulled into Penn Station with 1,200 souls aboard, officials said. Five were injured, authorities said.

The slow-speed derailment of the three middle cars happened as train 3926 from Trenton rolled onto Track Nine in the station at about 9 a.m., officials said.

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The impact was hard enough to break a wheel off of one of the cars, officials said.

Five people suffered minor injuries, the FDNY said. The passengers in the last four cars had to walk the tracks to reach the platform, officials said. All NJ Transit service into Penn Station was suspended for most of the morning.

FDNY Chief Roger Sakowich said the train had 10 cars plus a locomotive. Roughly 600 people evacuated had to walk the tracks to reach the platform.

"The biggest part of the issue was that the trains derailed in a way that it pinched the cars so that the doors to the cars did not align up. So we had to take people from the last four cars, which took a little bit of time, down onto the tracks," he said.

"After we removed power to make sure the scene was safe, we walked them along the road bed back up into a car that was closed to the station and removed them that way."

FDNY officials said Amtrak is investigating how the wheel broke off of one of the cars. There was also damage to the track and wheels on two train cars, Deputy Assistant Chief Michael Gala said.

In order to take the last injured person off the train, firefighters attached a locomotive and moved that train to another track and then got that person to medical help.

It took about two hours to get the scene under control and all the people evacuated.

"The investigation continues and the cause of the incident remains unknown," said NJ Transit spokeswoman Nancy Snyder.

Keisha Green, 26, found her commute fouled on her way to Hamilton, N.J. on a 9:01 a.m. train. She sat on the train waiting for it to leave, but after 15 minutes, the conductor announced they wouldn't be moving anytime soon.

"They said that the train was derailed," Green said. "He said it will be delayed. Last time it happened, it took several hours. I couldn't take my daughter to school and I couldn't go to work."

Limited NJ Transit service out of Penn Station was back by 1:05 p.m., while service into Penn Station restarted at 11:45 a.m.

NJ Transit warned riders to expect delays up to 30 minutes during the afternoon peak period from tight track space at Penn Station.

Firefighters respond to the scene in an FDNY photo. (fdny via Twitter)

Long Island Rail Road, meanwhile, was forced to cancel 18 trains out of Penn Station between 4 p.m. and 8 p.m. Eight other trains had to depart from other LIRR stations at Atlantic Terminal in Brooklyn and Jamaica, Queens.

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Amtrak spokesman Mike Tolbert said that it's working with NJ Transit to find out how the train derailed.

Tolbert said that the NJ Transit derailment appears to be unrelated to the March 24 derailment of a Washington, D.C.-bound Amtrak train that struck an NJ Transit car at Penn Station. No one was injured. The crash shut down NJ Transit service for most of the day.

Gala, of the FDNY, was present for that derailment.

"The last one, it was a little bit easier to take proper off the train and through the train," he said.

The Federal Railroad Administration counted 13 commuter train derailments in Manhattan from 2008 through January 2017.